diff --git a/support/scripts/gen-bootlin-toolchains b/support/scripts/gen-bootlin-toolchains
index 78123ed1a7..75fa2c7e0f 100755
--- a/support/scripts/gen-bootlin-toolchains
+++ b/support/scripts/gen-bootlin-toolchains
@@ -363,7 +363,7 @@ class Toolchain:
                 selects.append("BR2_ENABLE_LOCALE")
 
             # thread support
-            if frag.startswith("BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS"):
+            if frag.startswith("BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS="):
                 selects.append("BR2_TOOLCHAIN_HAS_THREADS")
 
             if frag.startswith("BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG"):